FOR RENT- Gorgeous floor-through on top floor of classic brownstone building convenient to Coolidge Corner, Longwood Medical Area + Beacon Street T-stop.   Original period details: grand rooms with soaring ceilings, crown molding, wood floors, bright top/3rd floor exposure, sprawling gourmet kitchen with white cabinets + sleek black granite countertops, gas cooktop.  Three large bedrooms + 4th room good for office/study, in unit full size washer/dryer, heat + one outdoor parking space included. NO smoking.   available 10/15